Originally Posted by MJM
You guys act as if this concept of very strong characters having childlike characteristics and qualities is a new thing for a Shonen series.
No, they act as if it is a new thing for the 1st Hokage, which it is. He was nothing like that when Orochimaru reanimated him the first time. We also didn't get any hint of it from any flashback he appeared in. Everything we've seen of him before this showed him as a mature, serious, powerful adult.
It's not a big deal, it's just a change that appeared out of nowhere and doesn't really fit with any of our preconceptions of him.